5 Simple Techniques For a-BBO Crystal
5 Simple Techniques For a-BBO Crystal
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High-precision laser microfabrication is a technique where components are processed and modified with a microscopic scale. This process requires a laser resource which will generate extremely concentrated and precise beams of light. The 266nm wavelength is particularly well suited for this because of its short wavelength, which ensures that the laser beam may be centered to an extremely compact spot dimensions.
Sadly, it could be quite challenging to check the LIDT specification of the optic to your laser. You'll find a number of regimes by which a pulsed laser can destruction an optic which is predicated about the laser's pulse size. The highlighted columns inside the table down below outline the relevant pulse lengths for our specified LIDT values.
While this guideline offers a common craze, It is far from a quantitative Examination of LIDT vs wavelength. In CW applications, By way of example, destruction scales extra strongly with absorption while in the coating and substrate, which does not essentially scale nicely with wavelength.
This effectiveness is vital, especially when just one considers the era with the 266nm wavelength, where even insignificant inefficiencies may result in considerable Power losses.
And finally, the extensive-angle tunability of BBOs facilitates customization like never ever prior to. Dependant upon the unique demands of an application, the crystal might be modified with precision, guaranteeing that the output is always optimized.
Nevertheless, it’s crucial that you note that although BBO crystals can transmit UV mild, they should be dealt with with treatment when Employed in UV programs to stop probable damage to the crystal and make certain security.
Determine 18: The standard and extraordinary refractive indices of β-BBO vary with frequency and wavelength due to a fabric residence named dispersion. Dispersion exists in all media apart from vacuum.
The angular material of a centered beam is usually visualized by tracing rays from your lens into the focal spot. Just about every ray drawn from the lens to some tightly centered location (Determine 23) can make another angle (ψ) While using the Main ray, and the range of angles raises With all the NA. As being the choice of angles boosts over and above the reference NA filter (or angular domain apodization filter width), the phase-matching of the rays outside of the filter width diminishes for that reason lessening the SHG conversion performance of Those people rays.
Now compare the utmost Strength density to that and that is specified as being the LIDT with the optic. In the event the optic was analyzed at a website wavelength besides your operating wavelength, the hurt threshold must be scaled correctly [three].
The team velocity is the speed of the heartbeat, or even more formally the envelope of the electrical industry. The team index similarly governs the speed on the envelope relative to the speed of light inside a vacuum and is also depending on the dispersion of the fabric.
It's commonly useful for nonlinear frequency conversion while in the ultraviolet, noticeable, and in the vicinity of-infrared. The BBO crystal may be the most crucial nonlinear crystal for near-infrared optical parametric chirped-pulse amplifiers, which at the moment provide couple optical cycle pulses with substantial regular and ultrahigh peak powers.
When picking an SHG crystal, the pulse duration with the laser resource has to be taken into account. A mismatch amongst the duration and crystal thickness will bring about SHG pulses extended in time and narrower in spectral content than feasible beneath excellent disorders.
Their supremacy In this particular area is not merely by chance, but a results of their intrinsic and meticulously crafted Qualities.
BBO’s flexibility definitely shines when one considers the breadth of its apps. It’s not just confined to at least one area of interest of photonics but stretches throughout various domains. Get frequency doubling, As an illustration. In this method, photons While using the identical frequency Incorporate throughout the crystal to provide new photons with double the frequency of the initial.